Image display apparatus

ABSTRACT

An image display apparatus includes a display, an image receiver to receive a high dynamic range image, and a controller to set luminance information of an image to be displayed based on brightness information of the high dynamic range image and information about a luminance that is displayable on the display and to perform control to display an image having a luminance adjusted based on the set image luminance information. Accordingly, the image display apparatus is capable of converting and displaying the high dynamic range image so as to match the luminance that is displayable on the display.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a Continuation Application of U.S. patentapplication Ser. No. 15/248,770, filed Aug. 26, 2016, which claimspriority benefit of U.S. Provisional Application No. 62/212,043, filedAug. 31, 2015, whose entire disclosures are hereby incorporated byreference.

BACKGROUND 1. Field

The present invention relates to an image display apparatus, and moreparticularly, to an image display apparatus capable of converting anddisplaying an input high dynamic range image so as to match luminancethat is displayable on a display.

2. Background

An image display apparatus has a function of providing an image that auser can view. The image display apparatus may receive and display abroadcasting image.

Recently, a high dynamic range (HDR) image has been proposed as a newinput in the display apparatus field. For the production, transmission,and display of content, discussions related to standardization of imageformat, compression and transmission signaling, interface, panelspecifications, and the like have been held.

HDR technology represents a departure from the production of an image sothat significantly wider brightness range may be shown in a single imagethat is possible in the related art.

The brightness range is referred to as a dynamic range. A high-qualitycamera having a wide dynamic range may be used, or two or more camerasmay be set so as to respectively cover different dynamic ranges so thata single high dynamic range image is ultimately produced.

BRIEF DESCRIPTION OF THE DRAWINGS

The embodiments will be described in detail with reference to thefollowing drawings in which like reference numerals refer to likeelements wherein:

FIG. 1 is a view illustrating the external appearance of an imagedisplay apparatus according to an embodiment of the present invention;

FIG. 2 is an example of an internal block diagram of the image displayapparatus illustrated in FIG. 1;

FIG. 3 is an example of an internal block diagram of a controllerillustrated in FIG. 2;

FIG. 4A is a view illustrating a control method of a remote controldevice illustrated in FIG. 2;

FIG. 4B is an internal block diagram of the remote control deviceillustrated in FIG. 2;

FIGS. 5A to 5D are flowcharts illustrating an example of a method ofoperating an image display apparatus according to various embodiments ofthe present invention; and

FIGS. 6A to 16B are views referenced to explain the operating method ofFIGS. 5A to 5D.

DETAILED DESCRIPTION

Hereinafter, the present invention will be described in more detail withreference to the drawings.

With respect to constituent elements used in the following description,suffixes “module” and “unit” are given or mingled with each other onlyin consideration of ease in the preparation of the specification, and donot have or serve as different meanings. Accordingly, the “module” and“unit” may be used interchangeably.

FIG. 1 is a view illustrating the external appearance of an imagedisplay apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the image display apparatus according to anembodiment of the present invention, designated by reference numeral100, may include a display 180, an image receiver (see reference numeral105 in FIG. 2) for receiving a high dynamic range (HDR) image, and acontroller (see reference numeral 170 in FIG. 2) for performing controlto set luminance information of an image to be displayed based onbrightness information of the HDR image and information about luminancethat is displayable on the display 180 and to display an image, theluminance of which is adjusted based on the set image luminanceinformation.

Thereby, the input HDR image may be converted and displayed so as tomatch the luminance that is displayable on the display 180.

Meanwhile, luminance up to 100 nit, which is a standard dynamic range(SDR) level, has emerged in an existing image as a broadcastingstandard.

Recent discussions on the standardization of HDR technology haveindicated the display of luminance within a wide range up to 1,000 nitor more.

An HDR image has greatly changed image properties compared to anexisting SDR image, and requires changes in many parts of an entiresystem, such as image format, related metadata, compression type, theinterface between equipment, high luminance/high contrast ratio panels,and the like.

When the dynamic range of an HDR image is greater than the dynamic rangeof a display panel, the image display apparatus 100 according to theembodiment of the present invention may perform mapping to match thedynamic range of the image with the dynamic range of the display 180.Accordingly, an image that matches the intention of the creator of theHDR image may be displayed.

The controller 170 may perform control to set color information of animage to be displayed based on color information of the HDR image andinformation about colors that are displayable on the display 180 and todisplay an image, the color of which is adjusted based on the set imagecolor information, thereby performing mapping, which corresponds to theinformation about colors that are displayable on the display 180. Inthis way, the image that matches the intention of the creator of the HDRimage may be displayed.

The controller 170 may perform control to set luminance information ofan image to be displayed based on luminance setting input regarding theimage to be displayed and to display an image, the luminance of which isadjusted based on the set image luminance information. Thereby, an imagethat matches the intention of the viewer may be displayed.

The controller 170 may perform control to set color information of animage to be displayed based on color setting input regarding the imageto be displayed and to display an image, the color of which is adjustedbased on the set image color information. Thereby, an image that matchesthe intention of the viewer may be displayed.

The controller 170 may perform control to set contrast information of animage to be displayed based on contrast setting input regarding theimage to be displayed and to display an image, the contrast of which isadjusted based on the set image contrast information. Thereby, an imagethat matches the intention of the viewer may be displayed.

Meanwhile, the controller 170 may perform control to set luminanceinformation of an image to be displayed, on a per-image-scene orper-image-frame basis, based on brightness information of the HDR imageon a per-image-scene or per-image-frame basis and information aboutluminance that is displayable on the display 180 and to display animage, the luminance of which is adjusted, on a per-image-scene orper-image-frame basis, based on the set image luminance information.Thereby, the image, the luminance of which is adjusted on aper-image-scene or per-image-frame basis, and which matches theintention of the creator of the HDR image, may be displayed.

The controller 170 may perform control to set luminance information ofan image to be displayed, on a per-image-scene or per-image-frame basis,based on luminance setting input regarding the image to be displayed andto display an image, the luminance of which is adjusted, on aper-image-scene or per-image-frame basis, based on the set imageluminance information. Thereby, the image, the luminance of which isadjusted on a per-image-scene or per-image-frame basis, and whichmatches the intention of the creator of the HDR image, may be displayed.

The controller 170 may perform control to extract maximum luminanceinformation from brightness information of the HDR image and to vary asaturation section upon luminance setting based on the maximum luminanceinformation. Accordingly, when the luminance of the HDR image isadjusted, adaptive luminance adjustment is possible.

The controller 170 may control the saturation section upon luminancesetting so as to be reduced as the maximum luminance level is increased.

The controller 170 may control the saturation section upon luminancesetting so as to be reduced as the set luminance level is increased.

Various methods of operating the image display apparatus 100 describedabove will be described below in more detail with reference to FIG. 5Aand the following drawings.

The image display apparatus 100 of FIG. 1 may be a TV, a monitor, atablet PC, a mobile terminal, a display apparatus for a vehicle, or thelike.

FIG. 2 is an example of an internal block diagram of the image displayapparatus illustrated in FIG. 1.

Referring to FIG. 2, the image display apparatus 100 according to anembodiment of the present invention may include the image receiver 105,an external device interface unit 130, a memory 140, a user inputinterface unit 150, a sensor unit (not illustrated), the controller 170,the display 180, and an audio output unit 185.

The image receiver 105 may include a tuner 110, a demodulator 120, anetwork interface unit 135, and the external device interface unit 130.

Unlike FIG. 2, the image receiver 105 may include only the tuner 110,the demodulator 120, and the external device interface unit 130. Thatis, the image receiver 105 may not include the network interface unit135.

The tuner 110 tunes a radio frequency (RF) broadcasting signal, whichcorresponds to a channel selected by the user, or all prestored channelsamong RF broadcasting signals received through an antenna (notillustrated). Then, the tuner 110 converts the tuned RF broadcastingsignal into an intermediate frequency (IF) signal or a baseband image orsound signal.

For example, when the tuned RF broadcasting signal is a digitalbroadcasting signal, the tuner 110 converts the digital broadcastingsignal into a digital IF (DIF) signal. When the tuned RF broadcastingsignal is an analogue broadcasting signal, the tuner 110 converts theanalogue broadcasting signal into an analogue baseband image or soundsignal. That is, the tuner 110 may process a digital broadcasting signalor analogue broadcasting signal. The analogue baseband image or soundsignal, output from the tuner 110, may be directly input to thecontroller 170.

In the present invention, the tuner 110 may sequentially tune RFbroadcasting signals of all broadcasting channels, which are stored viaa channel memory function, among the RF broadcasting signals receivedthrough the antenna, and may convert the tuned RF broadcasting signalsinto IF signals or baseband image or sound signals.

The tuner 110 may include a plurality of tuners, which receivebroadcasting signals from a plurality of channels respectively.Alternatively, the tuner 110 may include a single tuner, which receivesbroadcasting signals from a plurality of channels.

The demodulator 120 receives the DIF signal, converted by the tuner 110,and performs demodulation of the DIF signal.

The demodulator 120 may output a transport stream (TS) signal afterperforming demodulation and channel decoding. At this time, the TSsignal may be a multiplexed signal including an image signal, a soundsignal, and/or a data signal.

The TS signal, output from the demodulator 120, may be input to thecontroller 170. The controller 170 may perform, for example,demultiplexing and image/sound signal processing, and may output animage to the display 180 and output sound to the audio output unit 185.

The external device interface unit 130 may transmit or receive data toor from a connected external device (not illustrated), for example, aset-top box. To this end, the external device interface unit 130 mayinclude an A/V input/output unit (not illustrated).

The external device interface unit 130 may be connected, by a wire orwirelessly, to an external device, such as a digital versatile disc(DVD), Blu-ray disc, game device, camera, camcorder, computer (notebookcomputer), or set-top box, and may perform input/output operations withthe external device.

The A/V input/output unit may receive image and sound signals from theexternal device. Meanwhile, a wireless communication unit (notillustrated) may perform short-range wireless communication with otherelectronic appliances.

Through the wireless communication unit (not illustrated), the externaldevice interface unit 130 may exchange data with an adjacent mobileterminal. In particular, the external device interface unit 130 mayreceive, for example, device information, information about anapplication to be executed, and application images from the mobileterminal in a mirroring mode.

The network interface unit 135 provides an interface to connect theimage display apparatus 100 to a wired/wireless network including theInternet. For example, the network interface unit 135 may receivecontent or data, provided over the Internet or by a content provider ora network manager, through the network.

The network interface unit 135 may include a wireless communication unit(not illustrated).

The memory 140 may store programs for control and signal processing inthe controller 170, and may store processed image, sound or datasignals.

In addition, the memory 140 may perform a function for temporarilystoring image, sound or data signals input to the external deviceinterface unit 130. In addition, the memory 140 may store informationabout a predetermined broadcasting channel via a channel memoryfunction, such as a channel map.

While FIG. 2 illustrates the embodiment in which the memory 140 isprovided separately from the controller 170, the present invention isnot limited thereto. The memory 140 may be included in the controller170.

The user input interface unit 150 transfers a user input signal to thecontroller 170, or transfers a signal from the controller 170 to theuser.

For example, the user input interface unit 150 may transmit or receive auser input signal, such as power On/Off, channel selection, screensetup, etc., from a remote control device 200, may transmit a user inputsignal, input from local keys (not illustrated), such as a power key,channel key, volume key, setup key, etc., to the controller 170, maytransfer a user input signal, input from the sensor unit (notillustrated), which senses the user's gesture, to the controller 170, ormay transmit a signal from the controller 170 to the sensor unit (notillustrated).

The controller 170 may demultiplex a stream, input through the tuner110, the demodulator 120, the network interface unit 135, or theexternal device interface unit 130, or may generate and output a signalfor image or sound output by processing multiplexed signals.

An image signal processed in the controller 170 may be input to thedisplay 180 so as to be displayed in the form of an image correspondingto the image signal. In addition, the image signal processed in thecontroller 170 may be input to an external output device through theexternal device interface unit 130.

A sound signal processed in the controller 170 may be input to the audiooutput unit 185 so as to be output in the form of sound. In addition,the sound signal processed in the controller 170 may be input to anexternal output device through the external device interface unit 130.

Although not illustrated in FIG. 2, the controller 170 may include, forexample, a demultiplexer and an image processor. This will be describedlater with reference to FIG. 3.

In addition, the controller 170 may control the overall operation of theimage display apparatus 100. For example, the controller 170 may controlthe tuner 110 so as to tune an RF broadcasting corresponding to achannel selected by the user or a prestored channel.

In addition, the controller 170 may control the image display apparatus100 based on a user command input through the user input interface unit150 or internal programs.

The controller 170 may control the display 180 so as to display animage. At this time, the image displayed on the display 180 may be astill image or moving image, and may be a 2-dimensional (2D) or 3Dimage.

The controller 170 may allow a predetermined 2D object to be displayedin the image displayed on the display 180. For example, the object maybe at least one of an accessed web page (e.g. a newspaper or magazine),an electronic program guide (EPG), various menus, widgets, icons, stillimages, moving images, and text.

The controller 170 may recognize the user's position based on an imagecaptured by a capturing unit (not illustrated). For example, thecontroller 170 may recognize the distance (z-axis coordinate) betweenthe user and the image display apparatus 100. Moreover, the controller170 may recognize the x-axis coordinate and the y-axis coordinate in thedisplay 180 that correspond to the user's position.

The display 180 converts an image signal, data signal, OSD signal, orcontrol signal processed by the controller 170, or an image signal, datasignal, or control signal received from the external device interfaceunit 130 so as to generate a drive signal.

The display 180 may be, for example, a PDP, LCD, OLED, or flexibledisplay, and may also function as a 3D display. The 3D display 180 maybe divided into a glass type and a glass-free type.

The display 180 may be configured as a touchscreen so as to be used asan input device as well as an output device.

The audio output unit 185 receives a processed sound signal from thecontroller 170 and outputs sound.

The capturing unit (not illustrated) captures an image of the user.While the capturing unit (not illustrate) may be implemented as a singlecamera, the present invention is not limited thereto and the capturingunit may be implemented as a plurality of cameras. The capturing unit(not illustrated) may be embedded in the image display apparatus 100 ata position above the display 180, or may be separately provided. Imageinformation captured by the capturing unit (not illustrated) may beinput to the controller 170.

The controller 170 may sense the user's gesture based on the imagecaptured by the capturing unit (not illustrated), a sensed signal fromthe sensor unit (not illustrated), or a combination thereof.

A power supply unit 190 supplies a voltage to the entire image displayapparatus 100. In particular, the power supply unit 190 may supply avoltage to, for example, the controller 170, which may be implemented ina system-on-chip (SOC) form, the display 180 for image display, and theaudio output unit 185 for sound output.

Specifically, the power supply unit 190 may include a converter forconverting an AC voltage into a DC voltage, and a DC/DC transformer forconverting the level of DC voltage.

The remote control device 200 transmits user input to the user inputinterface unit 150. To this end, the remote control device 200 mayperform communication by Bluetooth, RF communication, infrared (IR)communication, Ultra Wideband (UWB), ZigBee, etc. In addition, theremote control device 200 may receive an image, sound or data signaloutput from the user input interface unit 150 so as to display an imageor to output sound.

The image display apparatus 100 described above may be a fixed ormovable digital broadcasting receiver that may receive digitalbroadcasts.

The block diagram of the image display apparatus 100 illustrated in FIG.2 illustrates one embodiment of the present invention. Respectivecomponents of the block diagram may be merged, added, or removeddepending on the specification of the image display apparatus 100 thatis actually implemented. That is, as needed, two or more components maybe merged into a single component, or a single component may be dividedinto two or more components. In addition, the function performed in eachblock is merely intended to describe the embodiment of the presentinvention, and a specific operation or a specific device related to thefunction does not limit the scope of the present invention.

FIG. 3 is an example of an internal block diagram of the controllerillustrated in FIG. 2.

Explaining with reference to FIG. 3, the controller 170 according to theembodiment of the present invention may include a demultiplexer 310, animage processor 320, a processor 330, an OSD generator 340, a mixer 345,a frame rate converter 350, and a formatter 360. In addition, thecontroller 170 may further include an audio processor (not illustrated)and a data processor (not illustrated).

The demultiplexer 310 demultiplexes an input stream. For example, whenan MPEG-2 TS is input, the demultiplexer 310 demultiplexes the inputstream so as to separate it into an image, sound and data signals. Here,the stream signal input to the demultiplexer 310 may be a stream signaloutput from the tuner 110, the demodulator 120, or the external deviceinterface unit 130.

The image processor 320 may perform image processing for a demultiplexedimage signal. To this end, the image processor 320 may be provided withan image decoder 325 and a scaler 335.

The image decoder 325 decodes the demultiplexed image signal, and thescaler 335 performs scaling of resolution for the decoded image signalso that an image may be output from the display 180.

The image decoder 325 may include decoders compliant with variousstandards. For example, the image decoder 325 may include an MPEG-2 orH.264 decoder, a 3D image decoder for a color image and a depth image,or a decoder for a multiple viewpoint image.

The processor 330 may control the overall operation of the image displayapparatus 100 or in the controller 170. For example, the processor 330may control the tuner 110 so as to tune an RF broadcasting correspondingto a channel selected by the user or a prestored channel.

In addition, the processor 330 may control the image display apparatus100 by a user command input via the user input interface unit 150, orinternal programs.

In addition, the processor 330 may perform control for data transmissionto or from the network interface unit 135 or the external deviceinterface unit 130.

In addition, the processor 330 may control operations of, for example,the demultiplexer 310, the image processor 320, and the OSD generator340 in the controller 170.

The OSD generator 340 generates an OSD signal by itself or in responseto user input. For example, the OSD generator 340 may generate a signalto display various pieces of information on the screen of the display180 in the form of graphics or text based on a user input signal. Thegenerated OSD signal may include various types of data, such as a userinterface screen of the image display apparatus, a screen displayingvarious menus, widgets, and icons. In addition, the generated OSD signalmay include a 2D object or 3D object.

In addition, the OSD generator 340 may generate a pointer, which may bedisplayed on the display 180, based on a pointing signal input from theremote control device 200. In particular, the pointer may be generatedin a pointing signal processor, and the OSD generator 340 may includethe pointing signal processor (not illustrated). Of course, the pointingsignal processor (not illustrated) may be provided separately, ratherthan being provided in the OSD generator 340.

The mixer 345 may mix the OSD signal generated in the OSD generator 340and the demodulated image signal processed in the image processor 320with each other. The mixed image signal is provided to the frame rateconverter 350.

The frame rate converter (FRC) 350 may convert the frame rate of aninput image. The frame rate converter 350 may output the input imagewithout separate frame rate conversion.

The formatter 360 may arrange a left-eye image frame and a right-eyeimage frame of a 3D image, the frame rate of which has been converted.Then, the formatter 360 may output a synchronous signal Vsync for theopening of a left-eye glass and a right-eye glass of a 3D viewing device(not illustrated).

The formatter 360 may change the format of an input image signal into animage signal, and may output the image signal so as to be displayed onthe display 180.

In addition, the formatter 360 may change the format of a 3D imagesignal. For example, the formatter 360 may change the format of a 3Dimage signal into one of various formats including a side-by-sideformat, a top/down format, a frame sequential format, an interlacedformat, and a checker box format.

The formatter 360 may convert a 2D image signal into a 3D image signal.For example, based on a 3D image generation algorithm, the formatter 360may detect an edge or a selectable object in the 2D image signal, andseparates an object depending on the detected edge or the selectableobject into a 3D image signal. At this time, the generated 3D imagesignal, as described above, may be divided into a left-eye image signalL and a right-eye image signal R, which will be subsequently arranged.

Although not illustrated in FIG. 3, a 3D processor (not illustrated) for3D effect signal processing may be additionally provided after theformatter 360. The 3D processor (not illustrated) may adjust, forexample, the brightness, tint, and color of an image signal to improve3D effects. For example, the 3D processor may perform signal processingto cause an image to be clear at a short distance and to be blurred at aremote distance. This function of the 3D processor may be integrated inthe formatter 360, or may be integrated in the image processor 320.

Meanwhile, the audio processor (not illustrated) in the controller 170may perform sound processing of a demultiplexed sound signal. To thisend, the audio processor (not illustrated) may include various decoders.

In addition, the audio processor (not illustrated) in the controller 170may process, for example, base, treble, or volume adjustment.

The data processor (not illustrated) in the controller 170 may performdata processing of a demultiplexed data signal. For example, when thedemultiplexed data signal is an encoded data signal, the data processormay decode the data signal. The encoded data signal may be electronicprogram guide (EPG) information, which includes broadcasting informationregarding a time table of broadcasting programs broadcast at eachchannel.

The block diagram of the controller 170 illustrated in FIG. 3 is a blockdiagram for one embodiment of the present invention. Respectivecomponents of the block diagram may be merged, added, or removeddepending on the specifications of the controller 170 to be actuallyimplemented.

In particular, the frame rate converter 350 and the formatter 360 may beseparately provided, rather than being provided in the controller 170,or may constitute a single module.

FIG. 4A is a view illustrating a control method of the remote controldevice illustrated in FIG. 2.

As illustrated in (a) of FIG. 4A, a pointer 205 corresponding to theremote control device 200 is displayed on the display 180.

The user may move or rotate the remote control device 200 upward ordownward, leftward or rightward (see (b) of FIG. 4A), and forward orrearward (see (c) of FIG. 4A). The pointer 205 displayed on the display180 corresponds to the movement of the remote control device 200. Theremote control device 200 may be referred to as a spatial remotecontroller or a 3D pointing device because the pointer 205 correspondingthereto is moved and displayed so as to match the movement of the remotecontrol device 200 in a 3D space as illustrated in FIG. 4A.

As illustrated in (b) of FIG. 4A, when the user moves the remote controldevice 200 leftward, the pointer 205, displayed on the display 180 ofthe image display apparatus, is correspondingly moved leftward.

Information about the movement of the remote control device 200, sensedby a sensor of the remote control device 200, is transmitted to theimage display apparatus. The image display apparatus may calculate thecoordinates of the pointer 205 from the information about the movementof the remote control device 200. The image display apparatus maydisplay the pointer 205 so as to match the calculated coordinates.

As illustrated in (c) of FIG. 4A, the user may move the remote controldevice 200 away from the display 180 while pushing a specific button onthe remote control device 200. Thereby, a selected area in the display180, which corresponds to the pointer 205, may be zoomed in so as to bedisplayed at an enlarged scale. On the contrary, when the user moves theremote control device 200 to the display 180 while pushing a specificbutton on the remote control device 200, a selected area in the display180, which corresponds to the pointer 205, may be zoomed out so as to bedisplayed at a reduced scale. That is, a selected area may be zoomed outwhen the remote control device 200 is moved away from the display 180,and may be zoomed in when the remote control device 200 is moved closerto the display 180.

In the state in which a specific button on the remote control device 200is pushed, upward/downward and leftward/rightward movements may not berecognized. That is, when the remote control device 200 is moved awayfrom or to the display 180, only forward/rearward movement may berecognized without the recognition of upward/downward andleftward/rightward movements. In the state in which no specific buttonon the remote control device 200 is pushed, the pointer 205 is moveddepending on the upward/downward and leftward/rightward movements of theremote control device 200.

The speed or direction of movement of the pointer 205 may match thespeed or direction of movement of the remote control device 200.

FIG. 4B is an internal block diagram of the remote control deviceillustrated in FIG. 2.

Explaining with reference to FIG. 4B, the remote control device 200 mayinclude a wireless communication unit 420, a user input unit 430, asensor unit 440, an output unit 450, a power supply unit 260, a memory470, and a controller 480.

The wireless communication unit 420 transmits and receives signals toand from any one of the image display apparatuses according to theembodiments of the present invention described above. Among the imagedisplay apparatuses according to the embodiments of the presentinvention, the single image display apparatus 100 will be describedbelow by way of example.

In the present embodiment, the remote control device 200 may include anRF module 421, which may transmit and receive signals to and from theimage display apparatus 100 based on an RF communication standard. Inaddition, the remote control device 200 may include an IR module 423,which may transmit and receive signals to and from the image displayapparatus 100 based on an IR communication standard.

In the present embodiment, the remote control device 200 transmits asignal, which includes information regarding, for example, the movementof the remote control device 200, to the image display apparatus 100 viathe RF module 421.

In addition, the remote control device 200 may receive a signaltransmitted from the image display apparatus 100 via the RF module 421.The remote control device 200 may transmit a command for power on/off,channel change, volume change, etc. to the image display apparatus 100via the IR module 423.

The user input unit 430 may include a keypad, buttons, a touch pad, atouchscreen, etc. The user may input a command related to the imagedisplay apparatus 100 to the remote control device 200 by operating theuser input unit 430. When the user input unit 430 includes hard keybuttons, the user may input a command related to the image displayapparatus 100 to the remote control device 200 by pushing the hard keybuttons. When the user input unit 430 includes a touchscreen, the usermay input a command related to the image display apparatus 100 to theremote control device 200 by touching soft keys on the touchscreen. Inaddition, the user input unit 435 may include various other input meansthat the user can operate, such as, for example, a scroll key or a jogwheel, and the present embodiment does not limit the scope of thepresent invention.

The sensor unit 440 may include a gyro sensor 441 or an accelerationsensor 443. The gyro sensor 441 may sense information regarding themovement of the remote control device 200.

In one example, the gyro sensor 441 may sense information about themovement of the remote control device 200 along the x-, y- and z-axes.The acceleration sensor 443 may sense information about the speed ofmovement of the remote control device 200. The sensor unit 440 mayfurther include a distance measurement sensor, and may sense thedistance to the display 180.

The output unit 450 may output an image or sound signal, whichcorresponds to the operation of the user input unit 430 or a signaltransmitted from the image display apparatus 100. The user may recognizewhether the user input unit 435 is operated or not, or whether the imagedisplay apparatus 100 is controlled or not via the output unit 450.

In one example, the output unit 450 may include an LED module 451, whichis illuminated when transmitting or receiving a signal to or from theimage display apparatus 100 via the wireless communication unit 425 orwhen the user input unit 435 is operated, a vibration module 453 forgenerating vibrations, a sound output module 455 for outputting sound,or a display module 457 for outputting an image.

The power supply unit 460 supplies power to the remote control device200. The power supply unit 460 may reduce power consumption by stoppingthe supply of power when the remote control device 200 is not movedduring a predetermined time. The power supply unit 460 may resume thesupply of power when a predetermined key provided on the remote controldevice 200 is operated.

The memory 470 may store various kinds of programs, application data,etc., which are required to control or operate the remote control device200. When the remote control device 200 wirelessly transmits or receivessignals to or from the image display apparatus 100 via the RF module421, the remote control device 200 and the image display apparatus 100transmit or receive signals using a predetermined frequency band. Thecontroller 480 of the remote control device 200 may store, in the memory470, for example, information about the frequency band in which theremote control device 200 is capable of wirelessly transmitting orreceiving signals to or from the image display apparatus 100 that ispaired with the remote control device 200, and may refer to the storedinformation.

The controller 480 controls various matters related to the control ofthe remote control device 200. The controller 480 may transmit a signal,which corresponds to the operation of a predetermined key in the userinput unit 430, or a signal, which corresponds to the movement of theremote control device 200 sensed by the sensor unit 440, to the imagedisplay apparatus 100 via the wireless communication unit 420.

The user input interface unit 150 of the image display apparatus 100 mayinclude a wireless communication unit 411, which may wirelessly transmitor receive signals to or from the remote control device 200, and acoordinate value calculator 415, which may calculate coordinate valuesof the pointer corresponding to the movement of the remote controldevice 200.

The user input interface unit 150 may wirelessly transmit or receivesignals to or from the remote control device 200 via an RF module 412.In addition, the user input interface unit 150 may receive signalstransmitted from the remote control device 200 based on an IRcommunication standard via an IF module 413.

The coordinate value calculator 415 may calculate coordinate values(x,y) of the pointer 205 to be displayed on the display 180 from asignal, which corresponds to the movement of the remote control device200, received via the wireless communication unit 411 via hand-shakingcorrection or error correction.

The transmission signal of the remote control device 200, input to theimage display apparatus 100 via the user input interface unit 150, istransmitted to the controller 170 of the image display apparatus 100.The controller 170 may determine information about the movement and keyoperation of the remote control device 200 from the signal transmittedfrom the remote control device 200, and may control the image displayapparatus 100 based on the determined information.

In another example, the remote control device 200 may calculate thecoordinate values of the pointer corresponding to the movement thereof,and may output the same to the user input interface unit 150 of theimage display apparatus 100. In this case, the user input interface unit150 of the image display apparatus 100 may transmit information aboutthe received coordinate values of the pointer to the controller 170without additional hand-shaking correction or error correction.

In a further example, the coordinate value calculator 415 may beprovided in the controller 170, rather than being provided in the userinput interface unit 150, unlike FIG. 4B.

FIGS. 5A to 5D are flowcharts illustrating one example of a method ofoperating the image display apparatus according to various embodimentsof the present invention.

First, FIG. 5A is a flowchart illustrating one example of a method ofoperating the image display apparatus according to an embodiment of thepresent invention.

Referring to FIG. 5A, the image receiver 105 in the image displayapparatus 100 may receive a high dynamic range (HDR) image (S510).

Here, the HDR image may mean an image having a luminance of 1,000 nit ormore. A standard dynamic range (SDR) image may mean an image having aluminance up to 100 nit.

In the present invention, the HDR image may mean an image that is largerthan the displayable dynamic range of the display panel 180. That is,when the maximum luminance of an input image is greater than the maximumluminance that is displayable on the display panel 180, the input imagemay be referred to as an HDR image.

Subsequently, the controller 170 in the image display apparatus 100 mayset luminance information of an image to be displayed based on thebrightness information of the HDR image and display information (S520).

Subsequently, the controller 170 in the image display apparatus 100 mayperform control to display an image, the luminance of which is adjustedbased on the set image luminance information (S540).

Specifically, the controller 170 in the image display apparatus 100 mayset the luminance information of the image to be displayed based on thebrightness information depending on the distribution of brightness inthe HDR image and information about luminance that is displayable on thedisplay 180 among the display information.

For example, the controller 170 in the image display apparatus 100 mayextract maximum luminance information based on the brightnessinformation of the HDR image, and may perform control to reduce asaturation section upon luminance setting as the maximum luminance isincreased, for the expression of a wide range of luminance. Accordingly,an image that matches the intention of the creator of the HDR image maybe displayed.

In particular, the controller 170 in the image display apparatus 100 mayextract maximum luminance information based on the brightnessinformation of the HDR image, and may perform control to reduce asaturation section upon luminance setting when the maximum luminance isgreater than the displayable saturation luminance of the display 180.Accordingly, an image that matches the intention of the creator of theHDR image may be displayed.

Meanwhile, the controller 170 may set luminance information of an imageto be displayed on a per-image-scene or per-image-frame basis based onthe brightness information of the HDR image on a per-image-scene orper-image-frame basis and information about luminance that isdisplayable on the display 180, and may perform control to display animage, the luminance of which is adjusted on a per-image-scene orper-image-frame basis based on the set image luminance information.Accordingly, an image, the luminance of which is adjusted on aper-image-scene or per-image-frame basis, and which matches theintention of the creator of the HDR image, may be displayed.

Next, FIG. 5B is a flowchart illustrating one example of a method ofoperating the image display apparatus according to another embodiment ofthe present invention.

The operating method of the image display apparatus of FIG. 5B issimilar to the operating method of the image display apparatus of FIG.5A, but has a difference in terms of the addition of Step 525 (S525).The following description is focused on the difference.

The controller 170 in the image display apparatus 100 may performcontrol to perform Step 525 (S525) and Step 540 (S540 m) after Step 520(S520).

The controller 170 in the image display apparatus 100 may set colorinformation of an image to be displayed based on color information ofthe HDR image and information about colors that are displayable on thedisplay 180 (S525).

Subsequently, the controller 170 in the image display apparatus 100 mayperform control to display an image, the color of which is adjustedbased on the set image color information, and the luminance of which isadjusted based on the set image luminance information (S540 m).

Here, each of the color information of the HDR image and the informationabout colors that are displayable on the display 180 may mean colorgamut information.

Specifically, the controller 170 in the image display apparatus 100 mayset color information of an image to be displayed based on colorinformation of the HDR image depending on color distribution andinformation about colors that are displayable on the display 180 amongdisplay information.

For example, the controller 170 in the image display apparatus 100 mayextract maximum color information based on the color information of theHDR image, and may perform control to reduce a saturation section uponcolor setting as the maximum color range is increased, for theexpression of a wide range of colors. Accordingly, an image that matchesthe intention of the creator of the HDR image may be displayed.

In particular, the controller 170 in the image display apparatus 100 mayextract maximum color information based on the color information of theHDR image, and may perform control to reduce a saturation section uponcolor setting when the maximum color range is greater than thedisplayable saturation color range of the display 180. Accordingly, animage that matches the intention of the creator of the HDR image may bedisplayed.

Meanwhile, the controller 170 may set color information of an image tobe displayed on a per-image-scene or per-image-frame basis based oncolor information of the HDR image on a per-image-scene orper-image-frame basis and the information about colors that aredisplayable on the display 180, and may perform control to display animage, the color of which is adjusted on a per-image-scene orper-image-frame basis based on the set image color information.Accordingly, an image, the color of which is adjusted on aper-image-scene or per-image-frame basis, and which matches theintention of the creator of the HDR image, may be displayed.

Next, FIG. 5C is a flowchart illustrating one example of a method ofoperating the image display apparatus according to another embodiment ofthe present invention.

The operating method of the image display apparatus of FIG. 5C issimilar to the operating method of the image display apparatus of FIG.5B. The following description is focused on the differencestherebetween.

The image receiver 105 in the image display apparatus 100 may receive anHDR image and metadata (S510 a).

Specifically, the image receiver 105 in the image display apparatus 100may receive an input image stream, and may separate an HDR image andmetadata from the input image stream.

Subsequently, the controller 170 in the image display apparatus 100 mayset luminance information of an image to be displayed based onbrightness information of the HDR image, image luminance information inthe metadata, and display information, and more particularly,information about luminance that is displayable on the display 180 (S520a).

Subsequently, the controller 170 in the image display apparatus 100 mayset color information of the image to be displayed based on colorinformation of the HDR image and display information, and moreparticularly, information about colors that are displayable on thedisplay 180 (S525 a).

Subsequently, the controller 170 in the image display apparatus 100 mayperform control to display the image, the color of which is adjustedbased on the set image color information, and the luminance of which isadjusted based on the set image luminance information (S540 a).

The image luminance information in the metadata may include, forexample, minimum image luminance information and maximum image luminanceinformation.

Meanwhile, the controller 170 may set luminance information of an imageto be displayed on a per-image-scene or per-image-frame basis based onbrightness information of the HDR image on a per-image-scene orper-image-frame basis, image luminance information in the metadata, andinformation about luminance that is displayable on the display 180, andmay perform control to display an image, the luminance of which isadjusted on a per-image-scene or per-image-frame basis based on the setimage luminance information. Accordingly, an image, the luminance ofwhich is adjusted on a per-image-scene or per-image-frame basis, andwhich matches the intention of the creator of the HDR image, may bedisplayed.

Next, FIG. 5D is a flowchart illustrating one example of a method ofoperating the image display apparatus according to another embodiment ofthe present invention.

The operating method of the image display apparatus of FIG. 5D issimilar to the operating method of the image display apparatus of FIG.5C, but has a difference in terms of the addition of setting input. Thefollowing description is focused on the difference.

The image receiver 105 in the image display apparatus 100 may receive anHDR image and metadata (S510 b).

Subsequently, the controller 170 in the image display apparatus 100 mayreceive user setting input via the user input interface unit 150 (S520b).

When any one of a luminance setting object, a color setting object and acontrast setting object in the setting screen displayed on the display180 is selected using the remote control device 200, the controller 170in the image display apparatus 100 may receive selected setting input.

For example, when luminance setting input is made via the luminancesetting object, Step 523 (S523) and Step 527 (S527) may be performed.

That is, the controller 170 in the image display apparatus 100 may setluminance information of an image to be displayed based on brightnessinformation of the HDR image, image luminance information in themetadata, and display information, and more particularly, informationabout luminance that is displayable on the display 180, and luminancesetting input (S523).

Subsequently, the controller 170 in the image display apparatus 100 mayset color information of the image to be displayed based on colorinformation of the HDR image and display information, and moreparticularly, information about colors that are displayable on thedisplay 180 (S525 b).

Subsequently, the controller 170 in the image display apparatus 100 mayperform control to display the image, the color of which is adjustedbased on the set image color information, and the luminance of which isadjusted based on the set image luminance information (S540 b).

On the other hand, when no luminance setting input is made via theluminance setting object, Step 520 (S520 b) and Step 525 (S525 b) may beperformed.

That is, the controller 170 in the image display apparatus 100 may setluminance information of an image to be displayed based on brightnessinformation of the HDR image, image luminance information in themetadata, and display information, and more particularly, informationabout luminance that is displayable on the display 180 (S520 b).

Subsequently, the controller 170 in the image display apparatus 100 mayset color information of the image to be displayed based on colorinformation of the HDR image and display information, and moreparticularly, information about colors that are displayable on thedisplay 180 (S525 b).

Subsequently, the controller 170 in the image display apparatus 100 mayperform control to display an image, the color of which is adjustedbased on the set image color information, and the luminance of which isadjusted based on the set image luminance information (S540 b).

Although not illustrated in FIG. 5D, when color setting input is madevia the color setting object, the controller 170 in the image displayapparatus 100 may set color information of an image to be displayedbased on color information of the HDR image, image color information inthe metadata, and display information, and more particularly,information about colors that are displayable on the display 180.

Subsequently, the controller 170 in the image display apparatus 100 mayperform control to display an image, the color of which is adjustedbased on the set image color information.

Although not illustrated in FIG. 5D, when contrast setting input is madevia the contrast setting object, the controller 170 in the image displayapparatus 100 may set contrast information of an image to be displayedbased on contrast information of the HDR image, image contrastinformation in the metadata, and display information, and moreparticularly, information about contrast that is displayable on thedisplay 180.

Subsequently, the controller 170 in the image display apparatus 100 mayperform control to display an image, the contrast of which is adjustedbased on the set image contrast information.

FIGS. 6A to 16B are views referenced to explain the operating method ofFIGS. 5A to 5D.

First, FIG. 6A illustrates one example of an internal block diagram ofthe controller of FIG. 2.

Referring to FIG. 6A, the controller 170 a of FIG. 6A may include animage analyzer 610, a metadata analyzer 620, a luminance mapping unit630, a picture-quality processor 635, and a color gamut mapping unit640.

The image analyzer 610 may receive an HDR image from the image receiver105, and may extract brightness information of the HDR image.

That is, the image analyzer 610 may analyze brightness of the HDR imagetransmitted from the image receiver 105, and may transmit the result ofanalysis of the brightness of the HDR image to the metadata analyzer620.

Specifically, the image analyzer 610 may generate a brightness histogramof the HDR image, and may transmit the distribution of brightness of theHDR image to the metadata analyzer 620.

The metadata analyzer 620 may set a first lookup table for setting theluminance of an image to be displayed based on brightness information ofthe HDR image, HDR image luminance information in the metadata, andinformation about luminance that is displayable on the display 180.

The metadata analyzer 620 may extract maximum luminance information fromthe brightness information of the HDR image, and may perform control tovary a saturation section upon luminance setting based on the maximumluminance information.

The meta data analyzer 620 may set luminance information of an image tobe displayed on a per-image-scene or per-image-frame basis based onbrightness information of the HDR image on a per-image-scene orper-image-frame basis and information about luminance that isdisplayable on the display 180.

The metadata analyzer 620 may set a second lookup table for setting thecolor of an image to be displayed based on HDR image color informationin the metadata and information about colors that are displayable on thedisplay 180.

The metadata analyzer 620 may set the first lookup table for setting theluminance of an image to be displayed based on luminance setting input,brightness information of the HDR image, HDR image luminance informationin the metadata, and information about luminance that is displayable onthe display 180.

In particular, the metadata analyzer 620 may extract maximum luminanceinformation and set luminance information depending on luminance settinginput from the brightness information of the HDR image, and may performcontrol to vary a saturation section upon luminance setting based on themaximum luminance information and the set luminance information.

The metadata analyzer 620 may perform control to reduce the saturationsection upon luminance setting as the maximum luminance level isincreased.

The metadata analyzer 620 may perform control to reduce the saturationsection upon luminance setting as the set luminance level is increased.

The metadata analyzer 620 may receive metadata and display information.

The metadata may include, for example, minimum image luminanceinformation, maximum image luminance information, image colorinformation, and mastering display information.

The display information may include, for example, information about theupper limit and lower limit of brightness that is displayable on thedisplay 180, and color gamut information.

The metadata analyzer 620 may extract information, required for imageluminance and color gamut mapping and contrast enhancement, from thereceived metadata.

The metadata analyzer 620 may set the relationship between the input HDRimage and the display 180 based on the metadata and display information.

Then, the metadata analyzer 620 may set a lookup table corresponding toa tone curve for the input HDR image and the display 180 based on theset relationship. In particular, the metadata analyzer 620 may renew thelookup table corresponding to the tone curve.

Then, the metadata analyzer 620 may renew and output a luminance lookuptable and a color lookup table.

The metadata analyzer 620 may renew and output the luminance lookuptable and the color lookup table on a per-image-scene or per-image-framebasis.

The luminance mapping unit 630 may perform mapping of luminanceinformation of an image to be displayed based on the first lookup tableset in the metadata analyzer 620.

Specifically, the luminance mapping unit 630 may adjust the luminance ofan image to be displayed based on the first lookup table set in themetadata analyzer 620.

For example, the luminance mapping unit 630 may adjust the luminance ofan image to be displayed based on brightness information of the HDRimage, HDR image luminance information in the metadata, and informationabout luminance that is displayable on the display 180.

In another example, the luminance mapping unit 630 may adjust theluminance of an image to be displayed based on luminance information ofthe HDR image, HDR image luminance information in the metadata,information about luminance that is displayable on the display 180, andsetting input.

In a further example, the luminance mapping unit 630 may adjust theluminance of an image to be displayed on a per-image-scene orper-image-frame basis of the HDR image.

The luminance mapping unit 630 may vary a saturation section uponluminance setting based on maximum luminance information of the HDRimage.

The luminance mapping unit 630 may adjust the saturation section uponluminance setting so as to be reduced as the maximum luminance level isincreased.

The luminance mapping unit 630 may adjust the saturation section uponluminance setting so as to be reduced as the set luminance level isincreased.

The luminance mapping unit 630 may perform luminance mapping inconsideration of the metadata and the brightness of the HDR image sothat desired image brightness is achieved.

The luminance mapping unit 630 may perform mapping of the image byadditionally considering adjusted contrast.

The luminance mapping unit 630 may perform 1D lookup table (LUT)processing on each sub channel (e.g. YCbCr/RGB) of the HDR image.

The picture-quality processor 635 may perform picture-quality processingon the image, which has been adjusted to the set luminance.

Specifically, the picture-quality processor 635 may perform, forexample, scaling, sharpness processing and contrast processing on theimage, which has been adjusted to the set luminance.

The color mapping unit 640 may perform mapping of the color informationof the image to be displayed based on the second lookup table set in themetadata analyzer 620.

In particular, the color mapping unit 640 may perform color mapping onthe image that has been subjected to picture-quality processing.

Specifically, the color mapping unit 640 may adjust the color of theimage to be displayed based on the second lookup table set in themetadata analyzer 620.

For example, the color mapping unit 640 may set the color of an image tobe displayed based on color information of the HDR image, HDR imagecolor information in the metadata, and information about colors that aredisplayable on the display 180.

In another example, the color mapping unit 640 may adjust the color ofan image to be displayed based on color information of the HDR image,HDR image color information in the metadata, information about colorsthat are displayable on the display 180, and setting input.

In a further example, the color mapping unit 640 may set the color of animage to be displayed on a per-image-scene or per-image-frame basis ofthe HDR image.

The luminance mapping unit 630 may vary a saturation section uponluminance setting based on maximum luminance information of the HDRimage.

The color gamut mapping unit 640 may adjust the saturation section uponcolor setting so as to be reduced as the maximum color level isincreased.

The color gamut mapping unit 640 may adjust the saturation section uponcolor setting so as to be reduced as the set color level is increased.

The color gamut mapping unit 640 may perform color mapping inconsideration of the metadata so that desired image colors are achieved.

The color gamut mapping unit 640 may perform 3×3 matrix calculation or3D LUT processing on the input HDR image.

Here, a matrix coefficient or LUT data may be data generated in themetadata analyzer 620.

Next, FIG. 6B illustrates another example of the internal block diagramof the controller of FIG. 2 according to the present invention.

The controller 170 b of FIG. 6B is similar to the controller 170 a ofFIG. 6A, but has a difference with respect to the sequence of operationof the color mapping unit 640 and the picture-quality processor 635.

That is, the color gamut mapping unit 640 of FIG. 6B may perform colormapping on the image that has been subjected to luminance mapping.

Then, the picture-quality processor 635 of FIG. 6B may performpicture-quality processing on the image that has been subjected to colormapping.

While FIGS. 6A and 6B illustrate a discrete type HDR image signalprocessing method in which luminance mapping and color mapping areseparately processed, in the present invention, luminance mapping andcolor mapping may be performed at the same time. This will be describedbelow with reference to FIG. 6C.

Next, FIG. 6C illustrates a further example of the internal blockdiagram of the controller of FIG. 2 according to the present invention.

The controller 170 c of FIG. 6C is similar to the controller 170 a ofFIG. 6A, but has a difference in that the luminance mapping unit 630 andthe color gamut mapping unit 640 are replaced by a luminance and colorgamut mapping unit 630 b. The following description is focused on thedifference.

The metadata analyzer 620 of FIG. 6C may set a third lookup table forsetting the luminance and color of an image to be displayed based onbrightness information of the HDR image, HDR image luminance informationin the metadata, information about luminance that is displayable on thedisplay 180, HDR image color information in the metadata, andinformation about colors that are displayable on the display 180.

The luminance and color gamut mapping unit 630 b may perform mapping ofluminance information and color information of the image to be displayedbased on the set third lookup table.

Accordingly, the luminance and color gamut mapping unit 630 b maysimultaneously adjust the luminance and color of an image to bedisplayed based on the set luminance information and the set colorinformation.

The luminance and color gamut mapping unit 630 b may perform 3D LUTprocessing by simultaneously applying sub channel information of theimage. At this time, LUT data may be data that are automatically ormanually generated in the metadata analyzer 620.

FIG. 7A illustrates an example of a general luminance mapping method inthe metadata analyzer 620.

The metadata analyzer 620 may include an electro-optic transfer function(EOTF) unit 710 for an image, a luminance tone mapping unit 720, and anopto-electronic transfer function (OETF) unit 730 for a display.

The EOTF unit 710 for an image may perform an EOTF in order to offsetOETF effects applied to an input image.

That is, the EOTF unit 710 for an image may change the luminance valueof an input image from a gamma domain to a linear domain.

The luminance tone mapping unit 720 may convert the luminance of theinput image into display luminance via a mapping function.

At this time, the mapping function may be represented by an LUT. The LUTmay be composed based on image luminance information in metadata andinformation about luminance that is displayable on the display 180 amongdisplay information.

Next, the OETF unit 730 for a display outputs an image by applying anOETF, corresponding to the EOTF, of a target display.

Because each unit of FIG. 7A may be applied in various color spaces,such as RGB, YCbCr, LAB and LUV, it is necessary to match color formatsbetween blocks at the input and output of each unit using a color spaceconversion device.

FIG. 7B is a view illustrating image luminance information included inmetadata and information about luminance that is displayable on thedisplay 180 among display information.

In FIG. 7B, the graph G_(ra) illustrates the case where the maximumluminance based on image luminance information is 10,000 nit and themaximum luminance that is displayable on the display is N_(a).

When the luminance of an input image ranges from 0 to N_(a), theluminance may be proportionately converted. In particular, the luminanceN_(a) of the input image may be converted to a luminance level N₁.

The input image may be displayed at the luminance level N₁, regardlessof the luminance of the input image, in a saturation section after themaximum luminance N_(a).

In the graph G_(ra), N_(a) may correspond to 100 nit and N₁ maycorrespond to 100 nit.

In FIG. 7B, the graph G_(rb) illustrates the case where the maximumluminance based on image luminance information is 10,000 nit and themaximum luminance that is displayable on the display is N_(b).

When the luminance of an input image ranges from 0 to N_(b), theluminance may be proportionately converted. In particular, the luminanceN_(b) of the input image may be converted to a luminance level N₂.

The input image may be displayed at the luminance level N₂, regardlessof the luminance of the input image, in a saturation section after themaximum luminance N_(b).

In the graph G_(rb), N_(b) may correspond to 400 nit and N₂ maycorrespond to 400 nit.

FIGS. 7B, 7C and 7D illustrate a method of combining three steps,performed by the three units 710, 720 and 730 of FIG. 7A, into one step.

The metadata analyzer 620 may set LUT data using image luminanceinformation included in metadata and luminance information of a targetdisplay.

Then, the metadata analyzer 620 may compose mapping LUT data usingrespective OETF code values corresponding to respective luminance valuesof the input image.

For example, when the maximum luminance that is displayable on thedisplay is N_(a), the metadata analyzer 620 may compose mapping LUT datausing the graph G_(ua) of FIG. 7C and the graph T_(a) of FIG. 7D.

In another example, when the maximum luminance that is displayable onthe display is N_(b), the metadata analyzer 620 may compose mapping LUTdata using the graph G_(ub) of FIG. 7C and the graph T_(b) of FIG. 7D.

That is, the metadata analyzer 620 may compose mapping LUT data bycombining and signal-processing the respective graphs of FIGS. 7B, 7Cand 7D.

As illustrated in FIG. 7D, the length of a saturation section is reducedas the maximum luminance that is displayable on the display isincreased. That is, the length of the saturation section is reduced atthe graph T_(b) compared to at the graph T_(a).

As illustrated in FIGS. 7A to 7D, through the adjustment of theluminance value, such as the composition of mapping LUT data, theluminance value may be converted to only the maximum luminance after thesaturation section because the luminance that is displayable on thetarget display is limited.

Therefore, the embodiment of the present invention proposes a method ofadaptively adjusting the luminance of a display image using imagebrightness information during the operation of the metadata analyzer.

FIG. 8A is a histogram illustrating one example of the brightnessinformation of an input image analyzed by the image analyzer 610.

Referring to FIG. 8A, “P_(om)” designates the maximum luminance of theinput image, and “P_(on)” designates the N % luminance of the inputimage.

FIG. 8B illustrates one example of adaptive LUT data modification usingimage brightness information during the operation of the metadataanalyzer.

The metadata analyzer 620 may set an LUT for setting the luminance of animage to be displayed based on set highest N % luminance pointinformation and maximum luminance information of the input image.

Specifically, the metadata analyzer 620 may renew the LUT for settingthe luminance of an image to be displayed based on information aboutluminance that is displayable on the display, set highest N % luminancepoint information, and maximum luminance information of the input image.

In FIG. 8B, “Ta” designates the graph corresponding to the first LUT forsetting the luminance of an image to be displayed when the luminancethat is displayable on the display is N_(a) nit (e.g. 100 nit).

The metadata analyzer 620 may perform control to adaptively vary thefirst LUT when the maximum luminance of the input image is greater thana saturation point of displayable luminance.

In particular, the metadata analyzer 620 may perform control toadaptively vary the first LUT using information about the highest N %luminance point set by, for example, user luminance setting input andthe maximum luminance information of the input image.

In FIG. 8B, “T_(ax)” designates the graph corresponding to the renewedfirst LUT for setting the luminance of an image to be displayed based onset highest N % luminance point information and maximum luminanceinformation of the input image in the case where the luminance that isdisplayable on the display is N_(a) nit (e.g. 100 nit).

In the graph “T_(ax)”, “P_(on)” designates a point corresponding to thehighest N % luminance point, “P_(aa)” designates a point correspondingto an existing saturation point T_(s), and “P_(om)” designates a newsaturation point corresponding to the maximum luminance information.

That is, through comparison of “T_(ax)” and “T_(a)”, the metadataanalyzer 620 may perform control to reduce the saturation section uponluminance level conversion.

The metadata analyzer 620 may perform control to reduce a saturationsection upon luminance setting as the maximum luminance level isincreased.

The metadata analyzer 620 may perform control to reduce a saturationperiod upon luminance setting as the set luminance level is increased.

Accordingly, as the saturation section is reduced upon luminance levelconversion with respect to the input HDR image, various levels ofluminance may be displayed.

The metadata analyzer 620 enables the display of various levels ofluminance by providing a plurality of conversion sections (including afirst section between P_(on) and P_(aa) and a second section betweenP_(aa) and P_(om)) between the point P_(on) corresponding to the highestN % luminance point and the new saturation point P_(om) corresponding tothe maximum luminance information.

In addition to the luminance adjustment, contrast adjustment may beperformed. This will be described below with reference to FIGS. 9A to9C.

FIGS. 9A to 9C are views referenced to explain a method of generating animage having increased perceived depth and an increased contrast ratiobased on the viewer's taste.

Like FIG. 8B, FIG. 9A illustrates an example of adaptive LUT datamodification using image brightness information during the operation ofthe metadata analyzer. In particular, FIG. 9A illustrates a luminancemapping lookup table. A description related to FIG. 9A may be replacedby the description of FIG. 8B, and thus will be omitted below.

FIG. 9B illustrates a contrast mapping lookup table.

“CT_(o)” designates the graph corresponding to a reference contrastlookup table, and “GT_(a)” designates a lookup table based on usercontrast setting input.

The metadata analyzer 620 may set the lookup table corresponding to thegraph CT_(a) based on user contrast setting input.

FIG. 9C illustrates a lookup table in the case where luminance mappingand contrast mapping are performed at the same time.

“CT_(o)” is the graph corresponding to a reference contrast lookuptable, and “CT_(aa)” is the graph corresponding to a luminance andcontrast lookup table based on user luminance setting input and usercontrast setting input.

That is, the metadata analyzer 620 may set a one-step LUT by connectingthe luminance lookup table of FIG. 9A and the contrast lookup table ofFIG. 9B to each other. The degree of contrast enhancement may also beadjusted by user selection.

Accordingly, the luminance mapping unit 630 may adjust the luminance ofthe input image using the lookup table corresponding to the graphCT_(aa).

The metadata analyzer 620 may set a color lookup table for coloradjustment. In particular, the color lookup table may be set similarlyto the luminance lookup table.

The metadata analyzer 620 may perform 3×3 matrix calculation or 3D LUTprocessing for color adjustment.

FIG. 10 illustrates the display of objects in relation to user luminancesetting input and user contrast setting input.

The controller 170 in the image display apparatus 100 may performcontrol to display, for example, a luminance setting object 1020, anautomatic setting object 1025, and a contrast setting object 1030, asillustrated in FIG. 10, when an image, and more particularly, an HDRimage is input.

The controller 170 in the image display apparatus 100 may determine theinput of the HDR image using, for example, metadata, and may performcontrol to display the luminance setting object 1020, the automaticsetting object 1025, and the contrast setting object 1030 as illustratedin FIG. 10 when the HDR image is input.

When a luminance setting bar in the luminance setting object 1020 is setso as to move to a specific position using a directional key(leftward/rightward key) or the pointer (see 205 in FIG. 4A) of theremote control device 200, the controller 170 in the image displayapparatus 100 may receive luminance setting input corresponding to thespecific position.

Then, the controller 170 in the image display apparatus 100, asdescribed above, may perform control to display an image, the luminanceof which is adjusted by adjusting the luminance of the HDR image basedon the luminance setting input.

When the automatic setting object 1025 is selected using an “enter” keyor the pointer (205 in FIG. 4A) of the remote control device 200, thecontroller 170 in the image display apparatus 100 may receive, forexample, automatic luminance setting input.

Then, the controller 170 in the image display apparatus 100, asdescribed above, may perform control to display an image, the luminanceof which is adjusted by adjusting the luminance of the HDR image basedon the automatic luminance setting input.

When a specific position in the contrast setting object 1030 is focusedusing a directional key (leftward/rightward key) or the pointer (see 205in FIG. 4A) of the remote control device 200, the controller 170 in theimage display apparatus 100 may receive contrast setting inputcorresponding to the specific position.

FIG. 10 illustrates that a “low” item 1030 b among a “high” item 1030 d,a “mid” item 1030 c, the “low” item 1030 b, and an “off” item 1030 areceives a focus.

The controller 170 in the image display apparatus 100, as describedabove, may perform control to display an image, the contrast of which isadjusted by adjusting the contrast of the HDR image based on contrastsetting input.

Although not illustrated in FIG. 10, the controller 170 in the imagedisplay apparatus 100 may perform control to display a color settingobject.

Then, the controller 170 in the image display apparatus 100, asdescribed above, may perform control to display an image, the color ofwhich is adjusted by adjusting the color of the HDR image based on colorsetting input.

FIG. 11A illustrates one example of an input HDR image 1110, FIG. 11Billustrates an image 1120, the luminance of which is adjusted based onthe lookup table corresponding to the graph T_(a) of FIG. 8B, and FIG.11C illustrates an image 1130, the luminance of which is adjusted basedon the lookup table corresponding to the graph T_(ax) of FIG. 8B.

It can be appreciated via comparison of FIGS. 11A to 11C that the image1130 of FIG. 11C, the luminance of which is adjusted, shows enrichedgradation compared to that of FIG. 11B, and is ultimately displayedconsiderably similarly to the input HDR image 1110.

In particular, it can be appreciated that the image 1130 shows darkspace gradation in a dark scene and is displayed considerably similarlyto the input HDR image 1110.

FIGS. 12A to 12C are views illustrating local brightness analysishistograms with respect to a dark area in each image of FIGS. 11A to11C.

FIG. 12A illustrates a dark area 1112 in the input HDR image 1110, anenlarged area 1114 thereof, and a local brightness histogram 1116 withrespect to the corresponding area.

FIG. 12B illustrates a dark area 1122 in the image 1120, the luminanceof which is adjusted using the lookup table corresponding to the graphT_(a) of FIG. 8B, an enlarged area 1124 thereof, and a local brightnesshistogram 1126 with respect to the corresponding area.

FIG. 12C illustrates a dark area 1132 in the image 1130, the luminanceof which is adjusted using the lookup table corresponding to the graphT_(ax) of FIG. 8B, an enlarged area 1134 thereof, and a local brightnesshistogram 1136 with respect to the corresponding area.

It can be appreciated via the comparison of respective local brightnesshistograms that the local brightness histogram 1116 of the input HDRimage 1110 and the local brightness histogram 1136 in the image 1130,the luminance of which is adjusted, are similar to each other.

FIGS. 12D to 12F are views illustrating local brightness analysishistogram with respect to a bright area in each image of FIGS. 11A to11C.

FIG. 12D illustrates a bright area 1113 in the input HDR image 1110, anenlarged area 1115 thereof, and a local brightness histogram 1117 withrespect to the corresponding area.

FIG. 12E illustrates a bright area 1123 in the image 1120, the luminanceof which is adjusted using the lookup table corresponding to the graphT_(a) of FIG. 8B, an enlarged area 1125 thereof, and a local brightnesshistogram 1127 with respect to the corresponding area.

FIG. 12F illustrates a bright area 1133 in the image 1130, the luminanceof which is adjusted using the lookup table corresponding to the graphT_(ax) of FIG. 8B, an enlarged area 1135 thereof, and a local brightnesshistogram 1137 with respect to the corresponding area.

It can be appreciated via the comparison of respective local brightnesshistograms that the local brightness histogram 1117 of the input HDRimage 1110 and the local brightness histogram 1137 in the image 1130,the luminance of which is adjusted, are similar to each other.

FIG. 13A illustrates another example of an input HDR image 1310, FIG.13B illustrates an image 1320, the luminance of which is adjusted usingthe lookup table corresponding to the graph T_(a) of FIG. 8B, and FIG.13C illustrates an image 1330, the luminance of which is adjusted usingthe lookup table corresponding to the graph T_(ax) of FIG. 8B.

FIGS. 14A to 14C are views illustrating local brightness analysishistograms with respect to a bright area in each image of FIGS. 13A to13C.

FIG. 14A illustrates a bright area 1312 in the input HDR image 1310, anenlarged area 1314 thereof, and a local brightness histogram 1316 withrespect to the corresponding area.

FIG. 14B illustrates a bright area 1322 in the image 1320, the luminanceof which is adjusted using the lookup table corresponding to the graphT_(a) of FIG. 8B, an enlarged area 1324 thereof, and a local brightnesshistogram 1326 with respect to the corresponding area.

FIG. 14C illustrates a bright area 1332 in the image 1330, the luminanceof which is adjusted using the lookup table corresponding to the graphT_(ax) of FIG. 8B, an enlarged area 1334 thereof, and a local brightnesshistogram 1336 with respect to the corresponding area.

It can be appreciated via the comparison of respective local brightnesshistograms that the local brightness histogram 1316 of the input HDRimage 1310 and the local brightness histogram 1336 in the image 1330,the luminance of which is adjusted, are similar to each other.

FIGS. 15A to 15C illustrate variation in an LUT for setting theluminance of an image to be displayed based on set highest N % luminancepoint information and maximum luminance information of an input image.

In particular, the metadata analyzer 620 may vary an LUT for setting theluminance of an image to be displayed based on set highest N % luminancepoint information and maximum luminance information of an input image.

The metadata analyzer 620 may set a lookup table based on informationabout the maximum displayable luminance of the display, as illustratedin FIG. 15A, when a set highest N % luminance point and the maximumluminance of the input image are lower than a saturation point of thedisplayable luminance.

In FIG. 15A, (b) illustrates a brightness histogram LLa of the inputimage in the case where the set highest N % luminance point P_(ona) andthe maximum luminance of the input image P_(oma) are lower than thesaturation point P_(sa) of the displayable luminance.

Accordingly, the metadata analyzer 620 may set a lookup tablecorresponding to the graph T_(aa). The lookup table corresponding to thegraph T_(aa) may be set based on information about the maximumdisplayable luminance of the display.

That is, the metadata analyzer 620 may maintain the existing graphT_(aa) when the set highest N % luminance point and the maximumluminance of the input image are lower than the saturation point of thedisplayable luminance.

Next, the metadata analyzer 620 may set a lookup table having aplurality of sections between a set highest N % luminance point and themaximum luminance of the input image, as illustrated in FIG. 15B, whenthe saturation point of the displayable luminance is located between theset highest N % luminance point and the maximum luminance of the inputimage.

In FIG. 15B, (b) illustrates a brightness histogram LLb of the inputimage in the case where the saturation point P_(sab) of the displayableluminance is located between the set highest N % luminance point P_(onb)and the maximum luminance of the input image P_(omb).

When the highest N % luminance point is located to the left of thesaturation point of the displayable luminance, as illustrated in (a) ofFIG. 15B, the metadata analyzer 620 may apply a user setting gain to they value of the saturation point of the displayable luminance on thebasis of a straight line between the highest N % luminance point and themaximum luminance of the input image.

Meanwhile, when the highest N % luminance point is located to the rightof a point immediately before the saturation point of the displayableluminance, the metadata analyzer 620 may apply a user setting gain tothe y value of the saturation point of the displayable luminance on thebasis of a straight line between the point immediately before thesaturation point of the displayable luminance and the maximum luminanceof the input image.

In this way, the metadata analyzer 620 may set a lookup tablecorresponding to the graph T_(axa). The lookup table corresponding tothe graph T_(axa) may be set based on information about the maximumdisplayable luminance of the display, user setting luminance input, andthe maximum luminance of the input image.

That is, the metadata analyzer 620 may maintain the existing graphT_(ab) in a section before the set highest N % luminance point, and mayset the renewed graph T_(axa) in a section after the set highest N %luminance point and before the maximum luminance of the input image.

Next, the metadata analyzer 620 may set a lookup table having aplurality of sections after the saturation point of the displayableluminance, as illustrated in FIG. 15C, when the set highest N %luminance point and the maximum luminance of the input image are higherthan the saturation point of the displayable luminance.

In FIG. 15C, (b) illustrates a brightness histogram LLc of the inputimage in the case where the set highest N % luminance point P_(onc) andthe maximum luminance of the input image P_(omc) are higher than thesaturation point P_(sac) of the displayable luminance.

When the highest N % luminance point P_(onc) and the maximum luminanceof the input image P_(omc) are located to the right of the saturationpoint P_(sac) of the displayable luminance, the metadata analyzer 620may apply a user setting gain to the y value between the saturationpoint P_(sac) and the highest N % luminance point P_(onc). Here, thegain may be a value between 0 and 1.

The metadata analyzer 620 may apply a secondary user setting gain(0-1.0) to the y value between the highest N % luminance point P_(onc)and the maximum luminance of the input image P_(omc).

Accordingly, the metadata analyzer 620 may set a lookup tablecorresponding to the graph T_(axb). The lookup table corresponding tothe graph T_(axb) may be set based on information about the maximumdisplayable luminance of the display, user setting luminance input, andthe maximum luminance of the input image.

That is, the metadata analyzer 620 may maintain the existing graphT_(ac) in a section before the saturation point P_(sac) of thedisplayable luminance, and may set the renewed graph T_(axb) in asection after the saturation point P_(sac) of the displayable luminanceand before the maximum luminance of the input image.

In this way, an image, the luminance of which is adjusted over a widerange, compared to the input image, may be displayed.

FIGS. 16A and 16B illustrate various examples of the internal blockdiagram of the image display apparatus of FIG. 1.

An image display apparatus 100 a of FIG. 16A may include the tuner 110,the image decoder 325, the processor 320, an HDR processor 1610, thepicture-quality processor 635, and the display 180.

The tuner 110, the image decoder 325, and the processor 320 may be thesame as each unit of FIGS. 2 and 3.

The processor 320 may transmit an HDR image and metadata to the HDRprocessor 1610.

The HDR processor 1610 may include the image analyzer 610, the metadataanalyzer 620, the luminance mapping unit 630, and the color mapping unit640 of FIG. 6B.

Alternatively, the HDR processor 1610 may include the metadata analyzer620, the luminance mapping unit 630 and the color mapping unit 640 ofFIG. 6B. In this case, the processor 320 may include the image analyzer610 of FIG. 6B.

An image display apparatus 100 b of FIG. 16B may include the tuner 110,the image decoder 325, the processor 320, a first HDR processor 1610 a,the picture-quality processor 635, a second HDR processor 1610 b, andthe display 180.

The tuner 110, the image decoder 325, and the processor 320 may be thesame as each unit of FIGS. 2 and 3.

The processor 320 may transmit an HDR image and metadata to the firstHDR processor 1610 a.

The first HDR processor 1610 a may include the image analyzer 610, themetadata analyzer 620, and the luminance mapping unit 630 of FIG. 6A.

The second HDR processor 1610 b may include the image analyzer 610 andthe color mapping unit 640 of FIG. 6A.

Alternatively, the first HDR processor 1610 a may include the metadataanalyzer 620 and the luminance mapping unit 630 of FIG. 6A. In thiscase, the processor 320 may include the image analyzer 610 of FIG. 6A.

The method of operating the image display apparatus according to thepresent invention may be implemented as a code that can be written on aprocessor readable recording medium provided in the image displayapparatus and thus can be read by a processor. The recording mediumincludes all kinds of recording devices in which data is stored in aprocessor readable manner. Examples of the processor readable recordingmedium may include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppydisc, and an optical data storage device. In addition, the processorreadable medium is implemented in a carrier wave (e.g., datatransmission over the Internet). In addition, the processor readablerecording medium may be distributed in a computer system connectedthereto via a network so that a processor readable code may be storedand executed in a distribution manner.

As is apparent from the above description, an image display apparatusaccording to an embodiment of the present invention includes a display,an image receiver to receive a high dynamic range (HDR) image, and acontroller to set luminance information of an image to be displayedbased on brightness information of the HDR image and information about aluminance that is displayable on the display and to perform control todisplay an image having a luminance adjusted based on the set imageluminance information, thereby converting and displaying the HDR imageso as to match the luminance that is displayable on the display.

When the dynamic range of the HDR image is greater than the dynamicrange of a display panel, mapping for matching the dynamic range of theHDR image with the dynamic range of the display panel may be performed.Accordingly, an image that matches the intention of the creator of theHDR image may be displayed.

The controller may set color information of an image to be displayedbased on color information of the HDR image and information about acolor that is displayable on the display, and may perform control todisplay an image having a color adjusted based on the set image colorinformation, thereby performing mapping corresponding to the informationabout a color that is displayable on the display. Accordingly, an imagethat matches the intention of the creator of the HDR image may bedisplayed.

The controller may set luminance information of an image to be displayedbased on luminance setting input with respect to the image to bedisplayed, and may perform control to display an image having aluminance adjusted based on the set image luminance information.Accordingly, an image that matches the intention of the viewer may bedisplayed.

The controller may set color information of an image to be displayedbased on color setting input with respect to the image to be displayed,and may perform control to display an image having a color adjustedbased on the set image color information. Accordingly, an image thatmatches the intention of the viewer may be displayed.

The controller may set contrast information of an image to be displayedbased on contrast setting input with respect to the image to bedisplayed, and may perform control to display an image having a contrastadjusted based on the set image contrast information. Accordingly, animage that matches the intention of the viewer may be displayed.

The controller may set luminance information of an image to be displayedon a per-image-scene or per-image-frame basis based on brightnessinformation of the HDR image on a per-image-scene or per-image-framebasis and information about a luminance that is displayable on thedisplay, and may perform control to display an image having a luminanceadjusted on a per-image-scene or per-image-frame basis based on the setimage luminance information. Accordingly, an image, the luminance ofwhich is adjusted on a per-image-scene or per-image-frame basis, andwhich matches the intention of the creator of the HDR image, may bedisplayed.

The controller may set luminance information of an image to be displayedon a per-image-scene or per-image-frame basis based on luminance settinginput with respect to the image to be displayed, and may perform controlto display an image having a luminance adjusted on a per-image-scene orper-image-frame basis based on the set image luminance information.Accordingly, an image, the luminance of which is adjusted on aper-image-scene or per-image-frame basis, and which matches theintention of the creator of the HDR image, may be displayed.

The controller may extract maximum luminance information from thebrightness information of the HDR image, and may perform control to varya saturation section upon luminance setting based on the maximumluminance information. Accordingly, adaptive luminance adjustment of theHDR image is possible.

The controller may perform control to reduce the saturation section uponluminance setting as a maximum luminance level based on the maximumluminance information is increased.

The controller may perform control to reduce the saturation section uponluminance setting as a set luminance level based on the set luminanceinformation is increased.

It is one object of the present invention to provide an image displayapparatus capable of converting and displaying a high dynamic rangeimage so as to match luminance that is displayable on a display.

It is another object of the present invention to provide an imagedisplay apparatus capable of converting and displaying a high dynamicrange image so as to match luminance that is displayable on a displayand user setting.

In accordance with one aspect of the present invention, the above andother objects can be accomplished by the provision of an image displayapparatus including a display, an image receiver to receive a highdynamic range image, and a controller to set luminance information of animage to be displayed based on brightness information of the highdynamic range image and information about a luminance that isdisplayable on the display and to perform control to display an imagehaving a luminance adjusted based on the set image luminanceinformation.

In accordance with another aspect of the present invention, there isprovided an image display apparatus including a display, an imagereceiver to receive a high dynamic range image, an interface unit toreceive luminance setting input with respect to an image to bedisplayed, and a controller to set luminance information of an image tobe displayed based on brightness information of the high dynamic rangeimage, information about a luminance that is displayable on the display,and the luminance setting input, and to perform control to display animage having a luminance adjusted based on the set image luminanceinformation, the controller performing control to reduce a saturationsection upon luminance setting as a set luminance level depending on theluminance setting input is increased.

Any reference in this specification to “one embodiment,” “anembodiment,” “example embodiment,” etc., means that a particularfeature, structure, or characteristic described in connection with theembodiment is included in at least one embodiment of the invention. Theappearances of such phrases in various places in the specification arenot necessarily all referring to the same embodiment. Further, when aparticular feature, structure, or characteristic is described inconnection with any embodiment, it is submitted that it is within thepurview of one skilled in the art to effect such feature, structure, orcharacteristic in connection with other ones of the embodiments.

Although embodiments have been described with reference to a number ofillustrative embodiments thereof, it should be understood that numerousother modifications and embodiments can be devised by those skilled inthe art that will fall within the spirit and scope of the principles ofthis disclosure. More particularly, various variations and modificationsare possible in the component parts and/or arrangements of the subjectcombination arrangement within the scope of the disclosure, the drawingsand the appended claims. In addition to variations and modifications inthe component parts and/or arrangements, alternative uses will also beapparent to those skilled in the art.

What is claimed is:
 1. An image display apparatus comprising: a display;an image receiver to receive a high dynamic range image; and acontroller to display at least one of a luminance setting object forsetting luminance of the high dynamic range image, an automatic settingobject for automatically setting the high dynamic range image, and acontrast setting object for setting contrast of the high dynamic rangeimage, wherein the controller is configured to: extract brightnessinformation of the high dynamic range image, extract maximum luminanceinformation from brightness information of the high dynamic range image,and perform control to vary a saturation section upon luminance settingbased on the maximum luminance information.
 2. The image displayapparatus according to claim 1, wherein when the high dynamic rangeimage is received, the controller is configured to automatically displayat least one of the luminance setting object for setting luminance ofthe high dynamic range image, the automatic setting object forautomatically setting the high dynamic range image, and the contrastsetting object for setting contrast of the high dynamic range image. 3.The image display apparatus according to claim 1, wherein the controlleris configured to: receive metadata, determine whether an image receivedfrom the image receiver is the high dynamic range image based on themetadata, when the received image is the high dynamic range image,display at least one of the luminance setting object for settingluminance of the high dynamic range image, the automatic setting objectfor automatically setting the high dynamic range image, and the contrastsetting object for setting contrast of the high dynamic range image. 4.The image display apparatus according to claim 1, wherein the controlleris configured to: in response to a directional key input or a pointerfrom a remote controller, receive luminance setting input based on theluminance setting object, in response to the luminance setting input,adjust the luminance of the high dynamic range image and display thehigh dynamic range image having the adjusted luminance.
 5. The imagedisplay apparatus according to claim 1, wherein the controller isconfigured to: in response to a directional key input or a pointer froma remote controller, receive automatic setting input based on theautomatic setting object, in response to the automatic setting input,automatically adjust the luminance of the high dynamic range image anddisplay the high dynamic range image having the automatically adjustedluminance.
 6. The image display apparatus according to claim 1, whereinthe controller is configured to: in response to a directional key inputor a pointer from a remote controller, receive contrast setting inputbased on the contrast setting object, in response to the contrastsetting input, adjust the contrast of the high dynamic range image anddisplay the high dynamic range image having the adjusted contrast. 7.The image display apparatus according to claim 1, wherein the contrastsetting object comprises a high item for high contrast setting, a miditem for mid contrast setting, a low item for low contrast setting, andan off item for turning off contrast setting.
 8. The image displayapparatus according to claim 1, wherein the controller is configured tofurther display a color setting object for setting color of the highdynamic range image.
 9. The image display apparatus according to claim8, wherein the controller is configured to: in response to a directionalkey input or a pointer from a remote controller, receive color settinginput based on the color setting object, in response to the colorsetting input, adjust the color of the high dynamic range image anddisplay the high dynamic range image having the adjusted color.
 10. Theimage display apparatus according to claim 1, wherein the controller isconfigured to: set luminance information of an image to be displayedbased on brightness information of the high dynamic range image,information about a luminance that is displayable on the display, andluminance setting input based on the luminance setting object, andperform control to display an image having a luminance adjusted based onthe set image luminance information.
 11. The image display apparatusaccording to claim 1, wherein the controller is configured to: setcontrast information of an image to be displayed based on brightnessinformation of the high dynamic range image, information about a colorthat is displayable on the display, and contrast setting input based onthe contrast setting object, and perform control to display an imagehaving a contrast adjusted based on the set image contrast information.12. The image display apparatus according to claim 1, wherein the imagereceiver separates the high dynamic range image and metadata from aninput image stream.
 13. The image display apparatus according to claim12, wherein the controller includes: an image analyzer to receive thehigh dynamic range image from the image receiver and to extractbrightness information of the high dynamic range image; a metadataanalyzer to generate a first lookup table for setting a luminance of animage to be displayed based on the brightness information of the highdynamic range image, luminance information of the high dynamic rangeimage in the metadata, and information about a luminance that isdisplayable on the display; and a luminance mapping unit to mapluminance information of the image to be displayed based on thegenerated first lookup table.
 14. The image display apparatus accordingto claim 13, wherein the metadata analyzer of the controller generates asecond lookup table for setting a color of an image to be displayedbased on color information of the high dynamic range image in themetadata and information about a color that is displayable on thedisplay, and wherein the controller further includes a color mappingunit to map color information of the image to be displayed based on thegenerated second lookup table.
 15. The image display apparatus accordingto claim 13, wherein the metadata analyzer extracts maximum luminanceinformation from the brightness information of the high dynamic rangeimage, and performs control to vary a saturation section upon luminancesetting based on the maximum luminance information.
 16. The imagedisplay apparatus according to claim 12, wherein the controllerincludes: an image analyzer to receive the high dynamic range image fromthe image receiver and to extract brightness information of the highdynamic range image; a metadata analyzer to generate a first lookuptable for setting a luminance of an image to be displayed based onluminance setting input, brightness information of the high dynamicrange image, luminance information of the high dynamic range image inthe metadata, and information about a luminance that is displayable onthe display; and a luminance mapping unit to map luminance informationof the image to be displayed based on the generated first lookup table.17. The image display apparatus according to claim 16, wherein themetadata analyzer extracts generated luminance information depending onthe luminance setting input and maximum luminance information from thebrightness information of the high dynamic range image, and performscontrol to vary a saturation section upon luminance setting based on themaximum luminance information and the generated luminance information.18. The image display apparatus according to claim 17, wherein themetadata analyzer performs control to reduce the saturation section uponluminance setting based on whether level of the maximum luminanceinformation is increased.
 19. An image display apparatus comprising: adisplay; an image receiver to receive a high dynamic range image; and acontroller to display at least one of a luminance setting object forsetting luminance of the high dynamic range image, an automatic settingobject for automatically setting the high dynamic range image, acontrast setting object for setting contrast of the high dynamic rangeimage, and a color setting object for setting color of the high dynamicrange image, wherein the controller is configured to: extract brightnessinformation of the high dynamic range image, extract maximum luminanceinformation from brightness information of the high dynamic range image,and perform control to vary a saturation section upon luminance settingbased on the maximum luminance information.